Illustrated Glossary of Organic Chemistry
The gas pressure exerted by vapors of a substance. Boiling
is defined as the temperature at which the vapor
pressure of the substance being boiled is equal to the ambient
pressure (atmospheric pressure, or less, if the sample is under
reduced pressure or a vacuum).
has a fairly high vapor pressure at room temperature, which
is why it has a very noticeable, minty odor. It is because
of this high vapor pressure that menthol
is used as a fragrant analgesic
in many over-the-counter pair relief medicines.
point of water
is 100oC at 1.0 atmosphere of pressure. At this
temperature the vapor pressure of water
vapor is equal to 1.0 atmosphere. At lower temperature water's
vapor pressure is lower, but still high enough that it
evaporates readily even at room temperature.
- Related terms: Melting
- Wikipedia entry